PowerFlex 750-Series AC Drives User Manual

3-82 Programming and ParametersFileGroupTORQUE CONTROLFriction CompNameNo. Description709 755 IA LdObs DelayInertia Adaption Load Observer DelayAdjusts a filter setting that is applied to the active motor velocity feedback source.The purpose of this filter is to reduce the level of noise present in the feedbacksignal. Note that this filter is the same type but separate from the filters used toprovide P127 [Pri Vel Feedback] and P130 [Alt Vel Feedback]. The derivative ofthe Sys Control Delay filtered motor velocity signal will be a Motor AccelerationFeedback signal. The Motor Acceleration Feedback is applied to the InertiaAdaption and Load Observer/ Load Estimate functions.This is moving average type filter that has a delay setting of N, where N is aninteger number (0, 1, 2 …). A setting of zero provides no filtering and no delay.Larger values of N result in more filtering and more delay. The best setting for thisfilter will depend on the level of noise present in the feedback signal and thebandwidth setting of the velocity regulator.710 755 InertAdptFiltBWInertia Adaption Filter BandwidthSets the bandwidth of a low pass filter located in the output of the vector controlspeed regulator and used in connection with the Inertia Adaption function. Thebandwidth of this filter should typically be set to five times the bandwidth of thespeed regulator. This setting is automatically made when the Inertia Adaptionfunction is active and the speed regulator bandwidth (P636 [Speed Reg BW]), isset to a non-zero value. If the speed regulator bandwidth is set to zero, then thisfilter setting must be manually adjusted.ValuesDefault:Options:3 = “50R/S Noise”0 = “190R/S Noise”1 = “160R/S Noise”2 = “100R/S Noise”3 = “50R/S Noise”4 = “25R/S Noise”5 = “12R/S Noise”6 = “6R/S Noise”7 = “3R/S Noise”Units: R/SDefault: 50.00Min/Max: 0.00 / 1000.00711 755 Load Observer BWUnits: R/SLoad Observer BandwidthDefault: 40.00Sets the bandwidth of a low pass filter located in the output of the Load Observer Min/Max: 1.00 / 1000.00function. Typical filter settings range from 10 radians/sec to 150 radians/sec withthe higher values being more responsive to disturbances but with increasedsystem noise. There is no nominal best setting, but 40 rad/sec is a suggestedstarting point. This selection may not function well in sloppy geared systems.Read-WriteData TypeRW 32-bitIntegerRW RealRW RealPowerFlex 750-Series User Manual – Publication 750-UM001C-EN-P – September 2009